E120 Router And E320 Router; Redundancy And Tunnel Distribution; References - Juniper JUNOSE 11.0.X IP SERVICES Configuration Manual

SMs provide dedicated tunnel-server ports that are always configured on the module.
Unlike other line modules, SMs do not pair with corresponding I/O modules that
contain ingress and egress ports. Instead, they receive data from and transmit data
to other line modules with access to ingress and egress ports on their own associated
I/O modules. However, you must assign interfaces on other line modules or loopback
interfaces to act as source endpoints for the tunnel.
You can also create IP tunnels on router modules that support shared tunnel-server
ports. You can configure (provision) a shared tunnel-server port to use a portion of
the module's bandwidth to provide tunnel services. For a list of the modules that
support shared tunnel-server ports, see the ERX Module Guide.
For information about configuring tunnel services on dedicated and shared
tunnel-server ports, see Managing Tunnel Service and IPSec Service Interfaces in JUNOSe
Physical Layer Configuration Guide.
All line modules forward traffic to IP tunnels. For information about which line
modules accept traffic for IP tunnels, see the ERX Module Guide.

E120 Router and E320 Router

To create IP tunnels on an E120 router or an E320 router, you must install an ES2
4G line module (LM) with an ES2-S1 Service I/O adapter (IOA), or an IOA that supports
the use of shared tunnel-server ports. For information about installing modules in
these routers, see the E120 and E320 Hardware Guide.
The ES2 4G LM and ES2-S1 Service IOA combination provides a dedicated
tunnel-server port that are always configured on the IOA. Unlike SMs, the ES2 4G
LM requires the ES2-S1 Service IOA to condition it to receive and transmit data to
other line modules. The ES2-S1 Service IOA also does not have ingress or egress
ports.
You can also create IP tunnels on IOAs that support shared tunnel-server ports. You
can configure (provision) a shared tunnel-server port to use a portion of the IOA's
bandwidth to provide tunnel services. For a list of the IOAs that support shared
tunnel-server ports, see the E120 and E320 Module Guide.
All line modules forward traffic to tunnels. For information about which IOAs accept
traffic for tunnels, see the E120 and E320 Module Guide.

Redundancy and Tunnel Distribution

For information about the redundancy and tunnel distribution mechanisms supported
for SMs, the ES2-S1 Service IOA, and shared tunnel-server ports, see Tunnel Service
Interface Considerations in JUNOSe Physical Layer Configuration Guide.

References

For more information about IP tunnels, see the following documents:
Chapter 9: Configuring IP Tunnels
247
References